3. Let x denote a real number. Find out the INCORRECT statement.
(A) S = { x x : > 3 } represents the set of all real numbers greater than 3
(B) S = { x x :
2 < 0 } represents the empty set
(C) S = { x x : ∈ A and x ∈ B } represents the union of set A and set B
(D) S = { x a : < x < b } represents the set of all real numbers between a and b,
where a and b are real numbers.
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